Directions:

Add essential oil to water and stir thoroughly.

Where to put it?

Place your DE mix as close as you can to where rodents live and eat.
If they live in your yard, you can dump it down their holes. If they are
in your home, leave your container of scented DE open on the counter or
floor where there is a problem. Just so you know, DE mixed with these
essential oils won't harm rodents, but it will overpower them with a
smell they can't stand, making them want to pack up and leave the
neighborhood.

How to Make Your Rodent Repellent Last

Your scented DE should maintain its potency much longer than cotton
balls, but it will eventually fade. Fortunately, it's easy to get it
back. If you add a little water and shake it up, it will bring back the
scent to about 70-80 percent of what it was originally. Mix another drop
or two of essential oil into the newly wet DE, and it will increase
the potency even more. Also, be sure to store scented DE that you aren't
using in an airtight container as this will help the scented DE retain
its potency.

Update...Because my rodents love my garage, I have made many of these little smell bombs and placed them around the garage. I leave the door open a bit so they can go somewhere else! Enjoy!